No problem at all using Sheldon Brown's method - just take it easy and check frequently! I always do each side in turn with minimal pressure and even so sometimes have to reset the drop outs a little closer again, but it's possible to be very accurate if you take time over the job and measure frequently. On many frames the cold-setting actually makes them MORE accurately aligned than before. However, 126 to 130mm might not need any resetting at all - you can often squeeze the 4mm wider OLN wheel in by flexing the stays apart 2mm each side with hand pressure and this does mean the wheel is securely held even before you close the skewer. Good luck, sounds like a good plan!